(3x-2)(9-x)=0⇔ [3x−2=09−x=0
⇔ [3x=2x=9
⇔ [x=23x=9
Vậy S={23;9}
(3x-2)(9-x)=0
⇔ [3x−2=09−x=0
⇔[3x=2−x=−9
⇔[x=2:3x=9
⇔[x=23x=9
Choose the best answer.
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Please turn off ___ lights when you leave ___ room.
I like _____ colorful costumes of ____ ethnic minority people in Vietnam.